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DescriptionThis bivalve can be up to 7 cm long and has an inflated triangular shape. The shell is brittle and white in colour, rarely cream. The outer thin layer of shell (periostracum) is greenish-yellow underneath which the shell has a granulated surface. The outer shell has irregular concentric lines and undulations and a smooth ridge runs from the beak (umbones), which is almost exactly midline, to the posterior ventral corner.Found in sand and mud offshore but never in large numbers.